Vibratory device



Sept. 11, 1928. 1 1,684,260 H. w. BROWN EI'AL 'VIBRATORY DEVICE Filed July 28. 1925 Invent OT"S Haro'ldw Brown,

, Allen ELBQiIeL Jrr,

Their" 'Attofineg.

.2 ture to. move to different positions eriodimanted se t. 11', 1923;

UNITED STATES I 1,684,260 RATE-NT OFFICE.

a mnonn w. nnown am) ALLEN E. smear, .m., or scnnnac'ranv, NEW term, as-

tsre'nons ro (mum rm'ac'rmc come ANY, A CORPORATION OI NEW YORK.

vmna'ronv imvrcn.

Application fled July 28,

Our invention relates to electrically o erated vibratory devices andhas for its o ject the provision of a vibrator having a low frequency of vibration. Y

,Our invention has various applications to devices requiring vibratory motion, such as bells, intermittent brakes, etc. It has particular application to indicating devices or .other members which have a tendency to spin at high speed, in which connection it may be used to apply a brake intermittently v to the indicating member in such manner that spinning is prevented, although the members-is free to move between'the-ap lications of the brake to a correct indicating position. I i

carrying out our invention we provide a magnet coil which is energized periodically and an armature operated by the coil, together with means vfor causingthe arma- (sally when the coil is energized. en the cod 1s energized .from an alternating current source, the armature may be 1n one position:

- durin one halfof a current cycle'and in its ot er position during one ceeding half cycles.

For a morecomplete understanding of I our invention reference should be had to the accompanying drawing, Fig. 1 of whichshows in diagrammatic -form a vibratory device embodyin our invention as a plied to the brakin o a motion receiving evice; while Fig; 2 1s a diagrammatic view of the motion receiving device.

Referring to the drawing, our invention in one form comprises a magnet coil 10 which ismounted, on a U-shaped magnet core 11, which is arranged to be energized intermittently by suitab e means. It may, *for. example, be energized from an alternating icurrent supp source .10 ."The magnetic circuit throng the core 111s com- 01 more sucj* ;pleted;by means'oi a movable armature 12 Q15 *fn'iadeof; magnetic material which is mount-.

fedion a -spring13., As shown,- the spring 13 5o which -ispivotally secured at one end to the core 11 at 16, and has'its other end adjustable about the 'plvot 16 by means pf ,a screw 17. Thisirew 17 cooperates Wlth hole in the eorerllsand passes a tapped i hasits'upper end secured at 14 near the ceni a brakepad 26 secured on the end of a flex1- ble arm 27. This brake pad engages one Q 10 1925. Serial 1N0. 46,688.

member -15.' A helical spring 18 is provided between the member 15- and the core 11 whereby the member 15 is pressed outward against the head of the screw 17.

g It will be observed that the armature 12 has a pivotal motion, permitted by the flexing of the spring 13, toward and away from the core 11'; The adjustment of the member 15 is such ,that the spring 13 tends to swing the armature away from the core against a stationary spring '19, forming a stop for the armature in its position most remote from thecore 11. The spring stop 19 consists of a resilient bar which is secured at its lower end to a supportin' member 20. Its

at a point somewhat above its fixed end, and its freedom toward the support 20 can be Isriegulated byg means of stop screw 22.

v ounted on he core 11 is a resilient bar spring 23 having one end fixed to the core and its free end extending into the path of the upper end of the armature 12 as it approac es the core. I This spring 23 is relatively heavy ascomparedwith the springs 13 and 19 and is strongenou h to prevent the armature-from being pu ed up to its position nearest the core unless the armature has first "been acceleratedirom. its most remote position designated by the stop spring 19. In other words, the pull ofthe ma netic attraction is not great; enough by itse f to bendthe spring 23 appreciably, butwhen the armature has been accelerated from its et coil on the armature due to ma position against the stop 19' its energy of armature has been brou ht up close to the 1 core by the bending o the. spring 23- is sufiicient to retain the armature in this po-' sition momentarily when the current is at 'or near its maximum instantaneous value.

On the. lower-end of the armature 12 is fixedan'arm or extension 25 which carries.

side of an indicating dial 28 when thearmae ture 12 is pulled up by the magnet coil. As

V I through an aperture in the free end of the motion receiving device is of a type oompris: 1 16 ing a olycircuit armature winding 31 (Fig. 1 armature is actually in engagement'with the 2) and a field winding 32 which is supplied spring 19 depends upon the resiliency of the from a source of alternating current -It will be understood that the receiving device is operated in accordance with motion applied to a transmitting device which is similar in construction, the two devices having their armature windings electrically connected. Receiving devices of this type have a tendency when suddenly accelerated to fall into step with the alternating current supply source ap lied to their high spee as synchronous motors. By apthe brake cycles.

plying the brake pad 26 intermittently to the dial 28 this tendency to spin is overcome,

while, at the same time, the dial is free to turn between the applications of the brake pad to its'correct indicating position. If

ad were applied with each alternation of t e alternating current supplyimpressed on the coil 10, in other words, each half cycle, the dial would have but .a'very short time in which to turn betweenthe applications of the brake. the vibratory mechanism is such, however, thai; the brake'is not applied every half cyc e.

The operation of the vibratory device is as follows: Upon the energization of the coil. 10 by a suitable source of alternating current, the armature 12, being then at rest against the stop 19, as shown in the drawing, will be pulled toward the core 11 and will compress the spring 23 upon striking it and be pulled to its to the coref The armature will be strongly attracted to this position while the half current cycle which set it in motion is near its crest, but when the instantaneous current falls and approaches zero the armature will be repelled violently by the heavy spring 23. By virtue of the repulsive action of the spring23 itself acting against the magnetic attraction of the coil as the current builds up in the opposite direction through'the remaining half of. the cycle, the armature is prevented from being pulled back toward the core during the next one or more half The acceleration imparted to the armature 12 by the spring 23 also plays'a large part in overcomin the attractive force of the magnet coil. T e result is' that the armature us thrown into engagement with the spring19 and the spring compressed to a certain extent depending upon ts adjust ment and its resiliency. As the sprin recovers it tends to throw the armature toward the coil and upon the occurrence of some subsequent half current cycle the armature is again attracted, as previously described. It will be observed that a. certain time interval is introduced while the armature is moving away'from the coil both fore and after its engagement with 'e spring 19. The interval during which the fields and move at" The operation of position of close proximity.

the frequency of-the supply source, whereas in previous devices the frequency of oscil lation is twice the, frequency of the supply source. The armature is thus attracted to its position in close proximity with the ma net coil during one half of a current cyc e and is released during one or more of the tollowin half current cycles and the brake pad 26 s applied accordingly. This gives the dial an opportunit to, turn between the applications of the bra e.

The spring 19 has the function not only of acting as a back stop but also of absorbing the energy of motion of the armature. By

/ adjusting the screw .21 the spring 19 can be adjusted to vary the gap,

i. e., the amplitude of vibration of the armature. The

screw 22 is adjusted to suitably limit the movement of the its breaking), of energy may be used in place of the spring 19 for absorbing the energy of the armature. The arrangement shown, for exam lc, may be adjusted for-a setting which Wlll cause the spring so as to prevent and also to vary the absorption y the spring. Various devices armature to be pulled up every other half cycle, it being thrown to its remote position during the intervening half cycles.

Although we have disclosedthe ma net coil 10 as being intermittently energize by connecting it to an alternating current Sll ply source, it may also be energized intermittently in various other ways,"such 1as by a pulsating direct current. In this case the direct. -c11rrent source of supply may, be broken by movement of the armature in a .well known manner. The.armature would then be attracted to the ma et coil during certain pulsations and repel ed to its remote position during the intervening pulsations.

.While we have described our invention as 7 embodiedcm concrete form and as operating 7 in a specific manner-1n accordance with the PIOVIlSlOIlS'Of the patent statutes, it should ack b e understood that we do not limit ouri invention thereto,-si nce various modifications thereof will ,suggestthemselves to those skilled in the art without departing from the spirit of our invention, which is set forth in the annexedclaims.

*What weclaim as new andzdesire to secure by Letters- Patent of the United States is:

1. A vibratory device comprising a magthe. scope of "tently, an armature movable toward and away from said/coil from one position to "when the coil is energized.

net coil arranged to be energized intermittently, an armature movable toward and away from said coil from one position to another, and means for causing. said armature to periodically occupy its position remote from said .coil when the coil is energized whereby the frequency of vibration of said armature is reduced.

2. A vvibratory device comprising a magnet coil arranged to be energized intermittently, an armature movable toward and away from said coil from one position to another, means for causing said armature to periodically occupy its position remote from said coil when the coil is energized whereby the frequency of vibration of said armature is reduced, and'means for varying the inter-- cycles in said coil, said armature being moved to its other position by the magnetic attraction ofsaid coil during the intervening half cycles. i 4. A vibratory device comprising a magnet, coil-"arranged to be energized intermitanother, means for biasing said armature to its position remote from said magnet coil, and means forthrowing said armature periodically to a position remote from said coil A vibratory device compris" a magnet coil arranged to be energized intermit- ,tently, an armature movable toward and away from said coil from one position to anpther, means for biasing said armature to its position remote from said magnet coil,

means for'throwing said armature periodi- 'cally to a position remote from said coil 7 when the coil is energized, and means for maintaining the armature in said remote position during intervals.

-6. A vibratory device comprising a magnet coil arranged to be energized intermit tently, an armature movable toward and a portion of the time away from said coil from one position to .another, means for biasing said armature to its position remote from said magnet coil, and resilient means compressed by movement of said armature toward said magnet coil-for periodically throwing said" armature to a position remote from the coil when the coil is energized whereby the frequency of vibration of said armature is reduced.

7. A vibratory device comprising a magnet coil arranged to be energized intermittently, an armature movable toward and .away from said coil from one positi n to another, a spring for biasing said ar ature" to its position remote from said magnet coil, and a second spring engaged and compressed by said armature when it approaches said magnet coil, said spring being arranged to throw said armature periodically to its position remote from said coil when the coil is energized whereby the fre uency of vibra tion of said armature is re uced. Y

' 8. A vibratory device comprising a magnet coil arranged to be supplied with alternating current, an armature movable toward and away from said coil from one position to another, a spring forbiasing, said arma ture to its position remote from said magnet coil, and a relatively heavy spring engaged and compressed periodicall by said armature as it nears said coil (hiring certain of coil said armature being thrown away from said coil during the-intervening half current cycles.

I the halfvoltage cycles impressed on said In witness whereof, we have hereunto set 9 our hands this 27th day of uly, 1925.

HAROLD W. BROWN. ALLEN E. BAILEY, JR. 

